Ok, looking thru the FAFSA paper form (for what you report) and the FAFSA formulas (for how it affects things) I find that tIRA withdrawals will appear in your AGI (question 85), and Roth IRA withdrawals appear in the untaxed income (question 94) as an add-back to income. IOW, they are invisible as ASSETS, but withdrawals are counted as income.
In practice, the first year you fill out the FAFSA these will probably not appear, since you won't withdraw until tuition bills arrive. The second year, those previous year withdrawals will change the FAFSA calculations. Some people try to pay from other sources the first few years, and then do the withdrawals only after the last FAFSA is filed mid-junior year.
Not to say that this is a bad plan, just run the numbers for all the years to see the effects, be willing to use different methods in different years, etc. Keep your eyes open to changes in the FAFSA rules and especially the tables. Those seem to shrink each year. Explore the Simplified Needs Test and Auto EFC = 0 test, especially the conditions for qualification (file 1040A, etc.).